<div align="center">
<table cellpadding="10" style="margin-left:0;">
<tr><td><hr width="500" /></td></tr>
<tr><td align="center" border="1" style="background-color:#C0C0C0">We must have a concrete idea of anything, even if it be an imaginary idea, before we can comprehend it.</td></tr>
<tr><td><hr width="500" /></td></tr>
</table>
</div>

Yeah, I tried the table thing, but as I said, large chunks of text tend to run off the bottom of the 'page', with no way to see the remainder - both in the mobi reader, and on my kindle3 (it says to move the 5way controller to see the rest of the table, but it doesn't work).

I think the <hr> is the best thing - perhaps changing the font as well.

Or maybe I should just chuck mobi altogether, and install FBReader on my Kindle